Tribulus Terrestris for Men: Benefits, Evidence & Dosage (UK Guide)

By Jordan Harvey · 16 July 2026 · Updated 21 August 2026 · 9 min read

Tribulus Terrestris is one of the most heavily marketed herbs in the men’s supplement aisle, usually sold on the promise of higher testosterone. Here is the honest summary up front: robust human evidence for a testosterone effect in healthy men is lacking. The herb does have a small body of trials around sexual function and some animal data, but the popular “testosterone” headline is not supported by the better-quality human studies. This UK guide explains what Tribulus is, what is actually inside it, what the trials show (and do not show), how it is dosed, whether it is safe, and how it compares to better-studied men’s herbs.

What Is Tribulus Terrestris?

Tribulus Terrestris is a small leafy plant in the caltrop family, found across southern Europe, Africa, the Middle East, southern Asia and Australia. Its common English name, “puncture vine”, comes from the hard, spiny seed pods that can puncture bare feet and bicycle tyres. The fruit, leaf and root have all been used in traditional Ayurvedic and Chinese herbal practice, often in the context of general male wellbeing.

In the modern supplement market, Tribulus is usually sold as a standardised dry extract in capsule or tablet form, frequently as part of a multi-ingredient “men’s” formula. It is worth separating two things from the start: traditional use, which is broad and historical, and clinical evidence, which is narrow and mixed. Most of the marketing leans on the first while implying the second.

What’s in It: Saponins and Protodioscin

The compounds that get the attention are steroidal saponins — naturally occurring plant molecules with a steroid-like backbone. (“Saponin” comes from the same root as “soap”: these compounds foam in water.) The most-discussed single saponin in Tribulus is protodioscin, and most reputable extracts are standardised to a stated saponin percentage — commonly 40%, 60%, or up to 90% — on the label.

Two practical points follow. First, saponin content varies enormously by where the plant was grown and which part was used, so the standardised percentage on the label matters more than the raw milligram figure. Second, “steroidal” in this context describes the chemical shape of the molecule, not a hormone the body can simply use — which is part of why the testosterone story is less straightforward than it sounds.

What the Evidence Actually Shows

This is where honesty matters most. Tribulus has no authorised European (EFSA) health claim, so nothing below should be read as a benefit you can expect from any product. Each finding is reported as a passive trial observation at the dose studied, with the standard caveat that ingredient findings do not transfer to any finished supplement.

Testosterone: the popular claim the human data does not support Evidence weak / mixed

The single biggest selling point for Tribulus — that it lift testosterone — is the claim with the weakest human support. In a controlled study by Neychev & Mitev (2005, n=21 young men, 10–20mg/kg/day for four weeks), Tribulus was not associated with any change in testosterone, free testosterone or other androgens compared with baseline (Neychev & Mitev, J Ethnopharmacol, 2005).

These are findings about the Tribulus ingredient at the doses studied in the cited trials. They are not health claims, and they do not transfer to any finished product, including Blue Power, which does not contain Tribulus.

Sexual function: a small, mixed signal Limited evidence

Where some trial signal does exist is around self-reported sexual function, mostly in men with an existing complaint rather than healthy men. In a 2017 randomised, placebo-controlled trial (Kamenov et al., n=180), Tribulus was associated with higher International Index of Erectile Function (IIEF) questionnaire scores than placebo at the dose studied; the authors framed the result around sexual desire and function on a validated questionnaire (Kamenov et al., Maturitas, 2017). Other trials have been smaller and less consistent, and the overall evidence base remains limited.

Sexual desire and function results above are research observations about the Tribulus ingredient at the doses studied in the cited trials. They are not product claims and do not apply to Blue Power or any other finished supplement.

Exercise and body composition: largely negative

Tribulus is sometimes sold to athletes for strength or muscle. The controlled human data is mostly unsupportive. In a placebo-controlled resistance-training study (Antonio et al., 2000, n=15 men, 3.21mg/kg/day for eight weeks), Tribulus was not associated with any greater gains in muscle, strength or body composition than placebo at the dose studied (Antonio et al., Int J Sport Nutr Exerc Metab, 2000). On current evidence, Tribulus is not a credible muscle-building aid.

Typical Dosage & Forms

There is no officially established dose, because there is no authorised health claim to anchor one. Across the trial literature and traditional use, the common range is 250–1,500mg/day of dry extract, usually split across the day and often standardised to 40–60% saponins (some products go to 90%). Higher saponin standardisation means a smaller tablet for the same active-compound content.

Is It Safe? Side Effects

In short-term trials Tribulus is generally well tolerated, with the most common complaints being mild digestive upset such as stomach cramps or reflux. There is no good long-term safety data in healthy men, because the long trials simply have not been done.

Tribulus vs Other Men’s Herbs

If your interest in Tribulus comes from the testosterone marketing, it is worth seeing where it sits against herbs with stronger human data. For broader context, see our guide to natural testosterone support and our overview of herbal supplements for men.

The honest takeaway: Tongkat Ali has the strongest human evidence of the three; Fadogia Agrestis is popular but rests on animal studies with no human trials; and Tribulus sits in between — widely sold, but with human testosterone evidence that does not hold up. None of the three should be treated as a guaranteed testosterone solution.

Frequently Asked Questions About Tribulus Terrestris

The Bottom Line

Tribulus Terrestris is a well-known herb with a marketing story that outruns its evidence. The headline testosterone claim is not supported by the better human trials, and the controlled exercise and body-composition data are largely negative. The clearest signal — still limited and mixed — is around self-reported sexual function in men with an existing complaint, and even that should be read as an ingredient finding rather than a guaranteed outcome.

If you are choosing supplements on evidence rather than packaging, Tribulus is a fair thing to be sceptical about. Herbs such as Tongkat Ali have stronger human data, and well-evidenced nutrients such as zinc carry authorised EFSA claims. Whatever you decide, buy from suppliers that disclose the saponin percentage and provide a Certificate of Analysis, and check with your GP if you take medication or have a medical condition.